Pathological narcissism is the art of deception. The narcissist projects a False Self and manages all his social interactions through this concocted fictional construct. People often find themselves involved with a narcissist (emotionally, in business, or otherwise) before they have a chance to discover his true nature.
When the narcissist reveals his true colors, it is usually far too late. His victims are unable to separate from him. They are frustrated by this acquired helplessness and angry that they failed to see through the narcissist earlier on.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 2 DVDs with 12 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)